// 排他思想进行中的
const li2 = document.querySelectorAll(".content_nav ul li");
li2.forEach((e) => {
  console.log(e);
  e.onclick = (el) => {
    console.log(el.target);
    if (el.target.tagName !== "LI") return;
    const old = document.querySelector(".active");
    old && old.classList.remove("active");
    el.target.classList.add("active");
  };
});
